problem. This process is called as centering of the averages. Example . Calculate three-yearly moving averages of number of students studying in a higher secondary school in a particular village from the following data.
Year Number of students XII Std - Business Maths & Stat EM Chapter - - Applied Statistics Computation of three- yearly moving averages. Year Number of students - yearly moving Total - yearly moving Averages --- --- . . .
. --- --- Table . Example . Calculate four-yearly moving averages of number of students studying in a higher secondary school in a particular city from the following data.
Year Number of students Computation of four- yearly moving averages. Year Sales -yearly centered moving total -yearly moving Average -yearly centered moving Average -- -- -- -- -- -- . -- . .
-- -- - -- -- - Table . The calculated -yearly centered moving average belongs to the particular year present in that row. In example . , the value .
belongs to the year . Note . . Method of Least Squares The line of best fit is a line from which the sum of the deviations of various points is zero.
This is the best method for obtaining the trend values. It gives a convenient basis for calculating the line of best fit for the time series. It is a mathematical method for measuring trend. Further the sum of the squares of these deviations would be